US11852337B2 - Flame hole unit structure of combustion apparatus - Google Patents

Flame hole unit structure of combustion apparatus Download PDF

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US11852337B2
US11852337B2 US16/647,709 US201816647709A US11852337B2 US 11852337 B2 US11852337 B2 US 11852337B2 US 201816647709 A US201816647709 A US 201816647709A US 11852337 B2 US11852337 B2 US 11852337B2
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flame hole
rich
lean
flame
horizontal
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US20200278113A1 (en
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Jun Kyu Park
Hyun Muk LIM
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Kyungdong Navien Co Ltd
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Kyungdong Navien Co Ltd
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Assigned to KYUNGDONG NAVIEN CO., LTD. reassignment KYUNGDONG NAVIEN CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LIM, HYUN MUK, PARK, JUN KYU
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F23D14/04—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner
    • F23D14/045—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone induction type, e.g. Bunsen burner with a plurality of burner bars assembled together, e.g. in a grid-like arrangement
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F23D14/583—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits
    • F23D14/586—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration of elongated shape, e.g. slits formed by a set of sheets, strips, ribbons or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/76—Protecting flame and burner parts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/48—Nozzles
    • F23D14/58—Nozzles characterised by the shape or arrangement of the outlet or outlets from the nozzle, e.g. of annular configuration
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/70—Baffles or like flow-disturbing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability

Definitions

  • a gas combustion apparatus refers to an apparatus for burning a supplied fuel gas to generate heat.
  • NOx nitrogen oxide
  • NOx not only causes acid rain, but also irritates eyes and a respiratory organ and kills plants. Therefore, NOx is regulated as a main air pollutant.
  • a fuel gas with a relatively low fuel ratio hereinafter, referred to as a lean gas
  • emission of NOx may be reduced.
  • the lean gas the burning velocity is reduced so that the combustion stability is weakened, and emission of carbon monoxide (CO) is increased.
  • the lean-rich burner refers to a burner configured such that a rich flame is located in an appropriate position around a lean flame.
  • the rich flame refers to a flame generated when a fuel gas with a relatively high fuel ratio (hereinafter, referred to as a rich gas) is burned.
  • a tertiary flame is formed while unburned fuel of the rich flame reacts with excess air of the lean flame, and therefore the combustion stability of the lean flame may be enhanced. This effect is called a flame stabilizing effect.
  • the lifting phenomenon refers to a phenomenon in which the release velocity of a fuel gas is higher than the burning velocity of the fuel gas so that a flame rises off from a flame hole.
  • the flames in which the lifting occurs are unstable and are easily extinguished, or a large amount of carbon monoxide is generated.
  • a flame hole structure of a combustion apparatus having a plurality of flame holes for forming a flame includes a lean flame hole part having at least one lean flame hole extending along a lengthwise direction that is a direction perpendicular to a release direction of a lean gas, as a flame hole to release the lean gas and a rich flame hole part having a pair of rich flame holes provided on opposite sides of the lean flame hole part with respect to a width direction that is a direction perpendicular to the release direction and the lengthwise direction, the pair of rich flame holes extending along a direction parallel to the lengthwise direction, as flame holes to release a rich gas.
  • a reference region refers to a region defined at an upper end of each rich flame hole by first and second lines that are any virtual lines across the rich flame hole and a pair of rich flame hole walls that are spaced apart from each other along the width direction and that form a portion of the rich flame hole between the first and second lines, and the rich flame hole includes, between any reference regions having the same size, a region designed such that when a flame by the rich gas is generated, the sum of amounts of heat transferred to a pair of rich flame hole walls that form each reference region is substantially the same.
  • a flame hole structure of a combustion apparatus having a plurality of flame holes for forming a flame includes a lean flame hole part having at least one lean flame hole extending along a lengthwise direction that is a direction perpendicular to a release direction of a lean gas, as a flame hole to release the lean gas and a rich flame hole part having a pair of rich flame holes provided on opposite sides of the lean flame hole part with respect to a width direction that is a direction perpendicular to the release direction and the lengthwise direction, the pair of rich flame holes extending along a direction parallel to the lengthwise direction, as flame holes to release a rich gas.
  • the lean flame hole includes at least one bent lean flame hole portion bent toward the center of the lean flame hole part along the width direction and horizontal lean flame hole portions provided on opposite sides of the bent lean flame hole portion with respect to the direction parallel to the lengthwise direction and extending along the direction parallel to the lengthwise direction.
  • the rich flame hole includes at least one protruding rich flame hole portion protruding toward the bent lean flame hole portion to correspond to the bent lean flame hole portion and horizontal rich flame hole portions provided on opposite sides of the protruding rich flame hole portion with respect to the direction parallel to the lengthwise direction and extending along the direction parallel to the lengthwise direction to correspond to the horizontal lean flame hole portions.
  • the rich flame hole part is provided to be spaced apart from the lean flame hole part by substantially the same interval.
  • a reference region refers to a region defined at an upper end of each rich flame hole by first and second lines that are any virtual lines across the rich flame hole and a pair of rich flame hole walls that are spaced apart from each other along the width direction and that form a portion of the rich flame hole between the first and second lines, and between any reference regions having the same size, the rich flame hole is designed such that when a flame by the rich gas is generated, the sum of amounts of heat transferred to physical boundaries that define each reference region is substantially the same.
  • a flame hole structure of a combustion apparatus having a plurality of flame holes for forming a flame includes a lean flame hole part extending along a lengthwise direction and having at least one lean flame hole that releases a lean gas and a rich flame hole part having a pair of rich flame holes provided on opposite sides of the lean flame hole part with respect to a width direction associated with the lengthwise direction, the pair of rich flame holes extending along a direction parallel to the lengthwise direction to release a rich gas.
  • a reference region refers to a region defined at an upper end of each rich flame hole by first and second lines that are any virtual lines across the rich flame hole and a pair of rich flame hole walls that are spaced apart from each other along the width direction and that form a portion of the rich flame hole between the first and second lines, and between any reference regions having the same size, the rich flame hole is designed such that the sum of lengths of upper ends of a pair of rich flame hole walls that form each reference region is substantially the same.
  • a flame hole structure of a combustion apparatus having a plurality of flame holes for forming a flame includes a lean flame hole part extending along a lengthwise direction and having at least one lean flame hole that releases a lean gas and a rich flame hole part having a pair of rich flame holes provided on opposite sides of the lean flame hole part with respect to a width direction associated with the lengthwise direction, the pair of rich flame holes extending along a direction parallel to the lengthwise direction to release a rich gas.
  • a reference region refers to a region defined at an upper end of each rich flame hole by first and second lines that are any virtual lines across the rich flame hole and a pair of rich flame hole walls that are spaced apart from each other along the width direction and that form a portion of the rich flame hole between the first and second lines, and between any reference regions having the same size, the rich flame hole is designed such that when a flame by the rich gas is generated, a burning velocity of the rich gas in each reference region is substantially the same.
  • a flame hole structure of a combustion apparatus having a plurality of flame holes for forming a flame includes a lean flame hole part having a lean flame hole formed in a spacing space between a plurality of lean plates as a flame hole to release a lean gas, the plurality of lean plates being disposed to be spaced apart from each other while facing each other along a width direction that is a direction that is perpendicular to a release direction of the lean gas and is also perpendicular to a lengthwise direction that is a direction perpendicular to the release direction and a rich flame hole part having rich flame holes provided on opposite sides of the lean flame hole part with respect to the width direction as flame holes to release a rich gas, each rich flame hole being formed in a spacing space between first and second rich plates disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction.
  • the plurality of lean plates include at least one bent lean plate portion bent toward the center of the lean flame hole part along the width direction and horizontal lean plate portions extending from opposite sides of the bent lean plate portion with respect to a direction parallel to the lengthwise direction along the direction parallel to the lengthwise direction.
  • the first and second rich plates include at least one first protruding rich plate portion and at least one second protruding rich plate portion protruding toward the bent lean plate portion to correspond to the bent lean plate portion and first and second horizontal rich plate portions extending from opposite sides of the first and second protruding rich plate portions with respect to the direction parallel to the lengthwise direction along the direction parallel to the lengthwise direction to correspond to the horizontal lean plate portions.
  • a length of a vertical line drawn from any point of at least one first horizontal rich plate portion toward the second horizontal rich plate portion is designed to be substantially the same as a length of a vertical line drawn from any point of the adjacent first protruding rich plate portion toward the second protruding rich plate portion.
  • a stable flame may be maintained in substantially all regions of each flame hole, and thus a uniform flame stabilizing effect may be achieved, with a reduction in NOx.
  • FIG. 1 is a schematic plan view illustrating flame hole structures of conventional lean-rich burners.
  • FIG. 2 is a schematic view illustrating a section of a flame hole structure to describe a lifting phenomenon.
  • FIG. 3 is a plan view illustrating a flame hole structure according to embodiment 1 of the present disclosure.
  • FIG. 4 is an enlarged view illustrating a region T 1 in a rich flame hole of FIG. 3 .
  • FIG. 5 is a plan view illustrating the flame hole structure according to embodiment 1 of the present disclosure in another aspect.
  • FIG. 6 is an enlarged view illustrating a region T 2 of FIG. 5 .
  • FIG. 8 is an enlarged view illustrating a region T 3 of FIG. 7 .
  • FIG. 9 is a plan view illustrating a flame hole structure according to embodiment 3 of the present disclosure.
  • FIG. 10 is a plan view illustrating the flame hole structure according to embodiment 3 of the present disclosure.
  • FIG. 11 is a schematic view illustrating a section taken along line C-C in FIG. 9 .
  • the inventors of the present disclosure have found the cause of the lifting phenomenon in the regions A and B of FIG. 1 .
  • FIG. 2 is a schematic view illustrating a section of a flame hole structure to describe a lifting phenomenon.
  • a rich flame F is generated around a flame hole wall 8 that forms the rich flame hole 7 .
  • the release velocity of the rich gas becomes higher than the burning velocity of the rich gas as the burning velocity decreases. Therefore, a problem may arise in which the rich flame F rises off the rich flame hole 7 and is immediately extinguished.
  • the amount of heat transferred to the flame hole wall per unit heating value of the rich gas is relatively larger than in the other region, and therefore a problem may arise in which a lifting phenomenon easily occurs in the region B.
  • the inventors of the present disclosure have derived the following flame hole structures of the combustion apparatus.
  • FIG. 3 is a plan view illustrating a flame hole structure according to embodiment 1 of the present disclosure.
  • FIG. 4 is an enlarged view illustrating a region T 1 in a rich flame hole of FIG. 3 .
  • FIG. 5 is a plan view illustrating the flame hole structure according to embodiment 1 of the present disclosure in another aspect.
  • FIG. 6 is an enlarged view illustrating a region T 2 of FIG. 5 .
  • a flame hole structure of a combustion apparatus including a plurality of flame holes for forming a flame according to embodiment 1 of the present disclosure will be described with reference to FIGS. 3 to 6 .
  • the flame hole structure according to embodiment 1 of the present disclosure includes a lean flame hole part 10 and a rich flame hole part 20 .
  • the lean flame hole part 10 includes at least one lean flame hole 11 for releasing a lean gas.
  • the lean flame hole 11 extends along a lengthwise direction x that is a direction perpendicular to a release direction z of the lean gas.
  • the lean gas released from the lean flame hole 11 is burned to form a lean flame, and the rich gas released from the rich flame holes 21 is burned to form a rich flame. Further, a flame stabilizing effect may occur while the lean flame and the rich flame exchange heat with each other.
  • the rich flame holes 21 are designed such that the flame stabilizing effect between the lean flame and the rich flame effectively occurs.
  • a reference region S refers to a region defined at an upper end of the rich flame hole 21 by a first line I, a second line II, and a pair of rich flame hole walls b.
  • the first and second lines I and II are any virtual lines across the rich flame hole 21
  • the rich flame hole walls b refer to walls that are spaced apart from each other along the width direction y and that form a portion of the rich flame hole 21 between the first and second lines I and II.
  • the rich flame hole 21 includes, between the reference regions, a region designed such that the sum of the amounts of heat transferred to the pair of rich flame hole walls b or b′, that is, the burning velocity of the rich gas in each reference region is substantially the same.
  • the rich flame hole 21 includes a region designed such that when a flame by the rich gas is generated, the sum Q of the amounts of heat transferred to the pair of rich flame hole walls b in the reference region S and the sum Q′ of the amounts of heat transferred to the pair of rich flame hole walls b′ in the reference region S′ are substantially the same.
  • the same amount of rich gas will be released at substantially the same release velocity, and substantially the same amount of heat will be generated when the rich gas is burned. Further, when the amounts of heat transferred from the reference regions S and S′ to the flame hole walls b and b′ are substantially the same, the burning velocities of the rich gas in the reference regions S and S′ will also be substantially the same, and therefore limit conditions in which lifting occurs in the reference regions S and S′ will be the same. Accordingly, when the rich gas is supplied to the reference regions S and S′ in an optimal condition capable of reducing emission of NOx, rich flames having substantially the same property will be generated in the reference regions S and S′.
  • substantially the same does not mean “numerically exactly the same”, but means the sameness to a degree that substantially the same action is caused in this technical field even though there is a slight numerical difference.
  • the rich flame hole 21 may be designed, between any reference regions having the same size, such that the sum of the lengths of upper ends of the pair of rich flame hole walls that form each reference region is substantially the same. That is, in FIG. 4 , the rich flame hole 21 may be designed such that the sum of the lengths of the pair of flame hole walls b that form the reference region S and the sum of the lengths of the pair of flame hole walls b′ that form the reference region S′ are substantially the same. When the sums of the lengths are the same, it may be considered that the areas of the flame hole walls to which heat is transferred are the same.
  • the limit condition in which lifting occurs is substantially the same and an equivalent flame stabilizing effect appears.
  • the numerical value of 15% does not have a special meaning and is an example for representing a range of a tolerance level that occurs during manufacturing.
  • the thickness and material of the flame hole walls may be adjusted such that the amounts of heat transferred to the flame hole walls are the same.
  • the rich flame hole may be designed, between any reference regions having the same size, such that the sum of the amounts of heat transferred to a physical boundary that includes a pair of flame hole walls and defines each reference region is substantially the same.
  • the lean flame hole 11 may include at least one bent lean flame hole portion 113 and horizontal lean flame hole portions 111 .
  • the bent lean flame hole portion 113 refers to a portion that is bent toward the center of the lean flame hole part 10 along the width direction y.
  • the horizontal lean flame hole portions 111 refer to portions that are provided on opposite sides of the bent lean flame hole portion 113 with respect to the direction parallel to the lengthwise direction x and that extend along the direction parallel to the lengthwise direction x.
  • the rich flame hole 21 may include a communication region that is a region formed to extend from any one horizontal rich flame hole portion 211 to another horizontal rich flame hole portion 211 through the adjacent protruding rich flame hole portion 213 .
  • the rich flame hole 21 may be designed, between the reference regions having the same size, such that the sum of the amounts of heat transferred to the pair of rich flame hole walls that form each reference region is substantially the same.
  • the plurality of lean/rich plates 13 and 23 may be disposed to be spaced apart from each other at a predetermined interval while facing each other along the width direction y. Further, the lean/rich flame holes 11 and 21 may be formed in spacing spaces between the lean/rich plates 13 and 23 . Furthermore, the partitioning part 30 may be formed between a first lean plate 13 a located at the outermost position with respect to the width direction y among the plurality of lean plates 13 and a first rich plate 23 a located at the innermost position with respect to the width direction y among the plurality of rich plates 23 .
  • the plurality of lean plates 13 may be bent at different angles to form the bent lean flame hole portions 113 . Further, the plurality of rich plates 23 may also form the protruding rich flame hole portions 213 .
  • the first lean plate 13 a may include at least one first bent lean plate portion 133 a and first horizontal lean plate portions 131 a provided on opposite sides of the first bent lean plate portion 133 a .
  • the first bent lean plate portion 133 a refers to a portion that is bent toward the center of the lean flame hole part 10 along the width direction y
  • the first horizontal lean plate portions 131 a refer to portions that extend along the direction parallel to the lengthwise direction x from the opposite sides of the first bent lean plate portion 133 a with respect to the direction parallel to the lengthwise direction x.
  • the flame hole structure according to embodiment 1 of the present disclosure may be designed such that the length of a vertical line 12 drawn from any point of at least one first bent lean plate portion 133 a toward the first protruding rich plate portion 233 a corresponding thereto is substantially the same as the lengths of vertical lines I 1 and I 3 drawn from any points of the adjacent first horizontal lean plate portion 131 a toward the first horizontal rich plate portion 231 corresponding thereto.
  • the rich flame hole part 20 may be provided to be spaced apart from the lean flame hole part 10 at substantially the same interval in a region extending from at least one horizontal rich flame hole portion 211 to another horizontal rich flame hole portion 211 through the adjacent protruding rich flame hole portion 213 (refer to FIG. 3 ).
  • the same interval does not mean numerically exact sameness.
  • the rich flame hole part 20 and the lean flame hole part 10 are designed to be spaced apart from each other by a distance L, when the actual interval is within an error range of about ⁇ 30% of the distance L, the rich flame hole part 20 and the lean flame hole part 10 may be considered to be spaced apart from each other by substantially the same interval.
  • the limit condition in which lifting occurs is substantially the same within the error range of about ⁇ 30% and an equivalent flame stabilizing effect appears.
  • the distance between the actual rich flame hole part and the actual lean flame hole part is within a range of about 0.9 mm to about 1.35 mm, the distance may be considered to be substantially the same.
  • ⁇ 30% or 0.9 mm to 0.35 mm does not have a special meaning as a numerical value itself and is only disclosed as an example for representing a range of substantially the same level, when a manufacturing tolerance is considered.
  • the interval between the lean flame and the rich flame generated from the bent lean flame hole portion 113 and the protruding rich flame hole portion 213 may be designed to be substantially the same as the interval between the lean flame and the rich flame generated from the horizontal lean flame hole portions 111 and the horizontal rich flame hole portions 211 .
  • an equivalent flame stabilizing effect may appear because the lean flame and the rich flame are separated from each other by the same interval in the entire region.
  • the length of a vertical line drawn from any point of the first bent lean plate portion 133 a toward the first protruding rich plate portion 233 a corresponding thereto is more preferably designed to be substantially the same as the length of a vertical line drawn from any point of the adjacent first horizontal lean plate portion 131 a toward the first horizontal rich plate portion 231 a corresponding thereto.
  • the lengths of the vertical lines or the intervals between the flames are substantially the same, numerically exact sameness is not required.
  • FIG. 7 is a plan view illustrating a flame hole structure according to embodiment 2 of the present disclosure.
  • FIG. 8 is an enlarged view illustrating a region T 3 of FIG. 7 .
  • the flame hole structure according to embodiment 2 of the present disclosure will be described with reference to FIGS. 7 and 8 .
  • components identical to those in embodiment 1 will be described using identical reference numerals.
  • the plurality of lean plates 13 include a bent lean plate portion 133 and a horizontal lean plate portion 131
  • the first and second rich plates 23 a and 23 b also include first and second protruding rich plate portions 233 a and 233 b corresponding to the bent lean plate portion 133 and first and second horizontal rich plate portions 231 a and 231 b corresponding to the horizontal lean plate portion 131 .
  • the flame hole structure according to embodiment 2 differs from the flame hole structure according to embodiment 1 in terms of the design structure of the rich flame holes 21 . More specifically, as illustrated in FIG. 8 , the flame hole structure according to embodiment 2 of the present disclosure is designed such that the lengths of vertical lines m 1 and m 3 drawn from any points of at least one first horizontal rich plate portion 231 a toward the second horizontal rich plate portion 231 b are substantially the same as the length of a vertical line m 2 drawn from any point of the adjacent first protruding rich plate portion 233 a toward the second protruding rich plate portion 233 b.
  • the amounts of heat transferred to flame hole walls are substantially the same between any reference regions having the same size.
  • the amounts of heat transferred to flame hole walls between any reference regions are substantially the same.
  • the amounts of heat transferred to flame hole walls may not be substantially the same when the sizes of the reference regions are the same.
  • the difference between the amounts of heat may be insignificant, and a flame stabilizing effect may be considered to substantially identically occur in the entirety of the rich region 21 designed as in embodiment 2 of the present disclosure.
  • FIG. 9 is a plan view illustrating a flame hole structure according to embodiment 3 of the present disclosure.
  • FIG. 10 is a plan view illustrating the flame hole structure according to embodiment 3 of the present disclosure.
  • FIG. 11 is a schematic view illustrating a section taken along line C-C in FIG. 9 .
  • the flame hole structure according to embodiment 3 of the present disclosure will be described with reference to FIGS. 9 to 11 .
  • components identical to those in embodiments 1 and 2 will be described using identical reference numerals, and unnecessary description will be omitted.
  • the flame hole structure according to embodiment 3 of the present disclosure may further include a binding member 40 in the flame hole structures according to embodiments 1 and 2.
  • the binding member 40 refers to a member that passes through a rich flame hole part 20 and a lean flame hole part 10 along the width direction y and binds the lean flame hole part 10 and the rich flame hole part 20 together.
  • lean flame holes 11 and rich flame holes 21 may be prevented from being changed in size (widened) when flames are generated in the lean flame holes 11 and the rich flame holes 21 .
  • the binding member 40 may be provided at a position spaced apart downward from upper ends of the lean flame hole part 10 and the rich flame hole part 20 at a predetermined interval (refer to FIG. 11 ).
  • the binding plate is provided at the upper end of the flame hole, and a flame cannot be generated in the portion where the plate is provided, so that a flame stabilizing effect cannot appear.
  • the binding member 40 according to embodiment 3 of the present disclosure is provided at the position spaced apart downward from the upper ends of the flame hole parts at the predetermined interval with respect to a direction parallel to the release direction z, the binding member 40 may not hinder generation of a flame.
  • the interval at which the binding member 40 is spaced apart from the upper ends is not specially limited, and the binding member 40 is preferably spaced to a position where the binding member 40 does not hinder generation of a flame and is capable of most effectively preventing the lean flame holes 11 and the rich flame holes 21 from being changed in size.
  • the type and the binding method of the binding member 40 are also not specially limited, and as illustrated in FIG. 8 , a method of inserting the binding rod 40 from one side along the width direction y and thereafter binding an opposite side using welding or plastic deformation may be used. Alternatively, as illustrated in FIG. 9 , a method of allowing a binding wire 40 ′ to pass through and thereafter binding opposite distal ends (portions represented by a dotted circle) through welding, knot, plastic deformation, or the like may be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)
US16/647,709 2017-09-19 2018-09-14 Flame hole unit structure of combustion apparatus Active 2040-09-01 US11852337B2 (en)

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KR1020170120538A KR102172467B1 (ko) 2017-09-19 2017-09-19 연소장치의 염공부 구조
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PCT/KR2018/010852 WO2019059592A1 (ko) 2017-09-19 2018-09-14 연소장치의 염공부 구조

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EP (2) EP3686490A4 (ja)
JP (1) JP7026211B2 (ja)
KR (1) KR102172467B1 (ja)
CN (1) CN111094849B (ja)
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